I/O virtualization for commissioning

ABSTRACT

Disclosed herein are techniques for virtualizing the I/O of control modules that are to be implemented by a process controller in the runtime environment of a process plant. A configuration application identifies references to the I/O objects utilized by the control modules. In response, the configuration application generates virtual device signal tags (DSTs) to mimic the performance of the identified I/O objects. To facilitate testing and/or verification of the control module, e.g., during the commissioning of a back-end environment, the configuration application instantiates a virtual controller in a simulation environment. To generate the virtual controller, the configuration application replaces any references to the I/O objects with references to respective, generated virtual DSTs. Thus, by using the virtual DSTs as a proxy for the I/O to the field devices, the control module and/or controller may be tested prior to the field devices without the field environment being fully commissioned.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to and the benefit of the filing dateof U.S. Provisional Patent Application No. 62/567,110, filed on Oct. 2,2017, entitled “I/O VIRTUALIZATION FOR COMMISSIONING,” the entiredisclosure of which is hereby expressly incorporated by referenceherein.

FIELD OF THE DISCLOSURE

The present disclosure relates generally to process plants and processcontrol systems, and more particularly, to virtualizing I/O componentsof a process control system to facilitate commissioning of a controller.

BACKGROUND

Distributed process control systems, like those used in chemical,petroleum, industrial or other process plants to manufacture, refine,transform, generate, or produce physical materials or products typicallyinclude one or more process controllers communicatively coupled to oneor more field devices via analog, digital or combined analog/digitalbuses, or via a wireless communication link or network. The fielddevices, which may be, for example, valves, valve positioners, switchesand transmitters (e.g., temperature, pressure, level and flow ratesensors), are located within the process environment and generallyperform physical or process control functions such as opening or closingvalves, measuring process and/or environmental parameters such astemperature or pressure, etc. to control one or more processes executingwithin the process plant or system. Smart field devices, such as thefield devices conforming to the well-known Fieldbus protocol may alsoperform control calculations, alarming functions, and other controlfunctions commonly implemented within the controller. The processcontrollers, which are also typically located within the plantenvironment, receive signals indicative of process measurements made bythe field devices and/or other information pertaining to the fielddevices and execute a controller application that runs, for example,different control modules which make process control decisions, generatecontrol signals based on the received information and coordinate withthe control modules or blocks being performed in the field devices, suchas HART®, WirelessHART®, and FOUNDATION® Fieldbus field devices. Thecontrol modules in the controller send the control signals over thecommunication lines or links to the field devices to thereby control theoperation of at least a portion of the process plant or system, e.g., tocontrol at least a portion of one or more industrial processes runningor executing within the plant or system. For example, the controllersand the field devices control at least a portion of a process beingcontrolled by the process plant or system. I/O devices, which are alsotypically located within the plant environment, typically are disposedbetween a controller and one or more field devices, and enablecommunications there between, e.g. by converting electrical signals intodigital values and vice versa.

Information from the field devices and the controller is usually madeavailable over a communication network to one or more other hardwaredevices, such as operator workstations, personal computers or computingdevices, data historians, report generators, centralized databases, orother centralized administrative computing devices that are typicallyplaced in control rooms or other locations away from the harsher plantenvironment. Each of these hardware devices typically is centralizedacross the process plant or across a portion of the process plant. Thesehardware devices run applications that may, for example, enable anoperator to perform functions with respect to controlling a processand/or operating the process plant, such as changing settings of theprocess control routine, modifying the operation of the control moduleswithin the controllers or the field devices, viewing the current stateof the process, viewing alarms generated by field devices andcontrollers, simulating the operation of the process for the purpose oftraining personnel or testing the process control software, keeping andupdating a configuration database, etc. The communication networkutilized by the hardware devices, controllers and field devices mayinclude a wired communication path, a wireless communication path, or acombination of wired and wireless communication paths.

As an example, the DeltaV™ control system, sold by Emerson ProcessManagement, includes multiple applications stored within and executed bydifferent devices located at diverse places within a process plant. Aconfiguration application, which resides in one or more workstations orcomputing devices, enables users to create or change process controlmodules and download these process control modules via a communicationnetwork to dedicated distributed controllers. Typically, these controlmodules are made up of communicatively interconnected function blocks,which are objects in an object oriented programming protocol thatperform functions within the control scheme based on inputs thereto andthat provide outputs to other function blocks within the control scheme.The configuration application may also allow a configuration designer tocreate or change operator interfaces which are used by a viewingapplication to display data to an operator and to enable the operator tochange settings, such as set points, within the process controlroutines. Each dedicated controller and, in some cases, one or morefield devices, stores and executes a respective controller applicationthat runs the control modules assigned and downloaded thereto toimplement actual process control functionality. The viewingapplications, which may be executed on one or more operator workstations(or on one or more remote computing devices in communicative connectionwith the operator workstations and the communication network), receivedata from the controller application via the communication network anddisplay this data to process control system designers, operators, orusers using the user interfaces, and may provide any of a number ofdifferent views, such as an operator's view, an engineer's view, atechnician's view, etc. A data historian application is typically storedin and executed by a data historian device that collects and stores someor all of the data provided across the communication network while aconfiguration database application may run in a still further computerattached to the communication network to store the current processcontrol routine configuration and data associated therewith.Alternatively, the configuration database may be located in the sameworkstation as the configuration application.

Generally, the commissioning of a process plant or system involvesbringing various components of the plant or system to the point wherethe system or plant can operate as intended. As is commonly known,physical process elements (such as valves, sensors, etc. that are to beutilized to control a process in a process plant) are installed atrespective locations within the field environment of the plant, e.g., inaccordance with Piping and Instrumentation Diagrams (P&IDs) and/or otherplans or “blueprints” of the plant floor layout and/or of the processlayout. After the process elements have been installed, at least some ofthe process elements are commissioned. For example, process controllers,I/O cards or devices, field devices, sampling points, and/or otherelements are subject to being commissioned. Commissioning is an involvedand complex process which typically includes multiple actions oractivities. For example, commissioning may include actions or activitiessuch as, inter alia, verifying or confirming an identity of an installedprocess control device (such as a field device, a controller, or an I/Odevice or card interconnecting a field device and a controller) and itsexpected connections; determining and providing tags that uniquelyidentify the process control device within the process control system orplant; setting or configuring initial values of parameters, limits, etc.for the device; verifying the correctness of the device's installation,operation and behaviors under various conditions, e.g., by manipulatingsignals provided to the devices and performing other tests, and othercommissioning activities and actions. Device verification duringcommissioning is important for safety reasons, as well as to conform toregulatory and quality requirements.

Typically, the commissioning of a process plant requires physicaldevices, connections, wiring, etc. to be installed, set up, andinter-connected in the field environment of the process plant. At theback-end environment of the plant (e.g., at the centralizedadministrative computing devices such as operator workstations, personalcomputers or computing devices, centralized databases, configurationtools, etc. that are typically placed in control rooms or otherlocations away from the harsher field environment of the plant), datathat specifically identifies and/or addresses the various devices, theirconfigurations, and their interconnections is integrated, verified orcommissioned, and stored.

Other commissioning actions or activities may relate to a processcontroller implementing a control routine in a process control loop thatincludes one or more I/O devices and one or more field devices. Suchcommissioning actions or activities include, for example, verifying thatvarious signals sent across various interconnections between devicesincluded in the process control loop result in expected behavior at bothends of the interconnection, integrity checks on the process controlloop, generating as-built I/O lists to indicate the actual physicalconnections of the devices that are implemented within the loop, as wellas recording other “as-installed” data, to name a few.

Traditionally, to commission control routines or strategies that are toexecute during runtime in process controllers, the back-end operatordownloads test or simulation logic into a controller disposed in thefield or front-end environment, downloads the subject control routine orstrategy (which may be implemented as one or more control modules, forexample) into the controller, and executes the downloaded simulationlogic to verify the executing behavior of the subject control routine.In one example, downloaded simulation logic includes a simulation moduleinterconnected to an input of the controller. However, as the simulationcontrol routine is downloaded into the controller, this portion of thecommissioning process requires, as pre-conditions, the physical pathbetween the back-end environment and the controller to be commissioned,and/or the I/O devices and field devices associated with the controllerto be commissioned. Thus, in some aspects, the commissioning of thesignaling paths of the process plant and/or the commissioning of the I/Oand field devices gates the commissioning of the control routine,thereby extending the time it takes to commission a process plant.

Additionally, as the field engineer commissions the field devices withinthe field environment, the field engineer may assign newly commissionedfield devices to the controller. Similarly, the field engineer maymodify a field device that was already assigned to the controller, suchas by assigning the field device to a different controller. Accordingly,the back-end operator must adjust and re-download the control routineinto the controller to account for these and similar changes whenconducting simulations and testing of control routines and loops duringcommissioning.

SUMMARY

Techniques, systems, apparatuses, components, devices, and methods forvirtualizing input/output (I/O) (e.g., for virtualizing I/O blocksand/or other portions of an I/O device) to facilitate controllercommissioning are disclosed herein. Said techniques, systems,apparatuses, components, devices, and methods may apply to industrialprocess control systems, environments, and/or plants, which areinterchangeably referred to herein as “industrial control,” “processcontrol,” or “process” systems, environments, and/or plants. Typically,such systems and plants provide control, in a distributed manner, of oneor more processes (also referred to herein as “industrial processes”)that operate to manufacture, refine, or transform, raw physicalmaterials to generate or produce products.

I/O virtualization during the commissioning of process control systemsand/or plants include various techniques, systems, apparatuses,components, and/or methods that allow for at least some portions of thecommissioning process to be performed asynchronously, so thatcontrollers and devices controlled by controllers may be partially oreven entirely commissioned prior to being incorporated or integratedinto the plant or system as a whole. I/O virtualization duringcommissioning allows, for example, various portions of process controlsystems and/or their respective safety instrumented systems (SIS) (e.g.,stand-alone or integrated safety systems (ICSS)) or basic processcontrol systems (BPCS) to be built and at least partially commissionedat different geographical locations (e.g., at different “mod yards”)prior to being brought together and integrated at the resident locationor site of the process plant. In a sense, I/O virtualization allows forparallel commissioning activities and actions to take place.

For example, I/O virtualization allows for some (if not most)commissioning activities and/or actions to be performed independently(and indeed, in parallel, if desired) in the field environment and inthe back-end environment of the process plant. Commissioning of thedesign and engineering implemented in the field environment no longer isdependent on the progress (and completion) of the functional design,engineering, and commissioning being performed and mostly completed inthe back-end environment. As such, a significant portion of thecommissioning of the functional or logical components of the back-endenvironment are able to be performed independently of localcommissioning activities of the physical components of the fieldenvironment, and vice versa. That is, at least some portion ofcommissioning activities and actions in either the field environment orthe back-end environment may be performed while the field environmentand the back-end environment are communicatively disconnected, e.g.,while a loop (or portion thereof) that has been (or is being) installedin the field environment is communicatively disconnected from theback-end environment. For instance, using I/O virtualization techniques,at least some of portion of the commissioning activities and actions inthe field environment and/or in the back-end environment are able to beperformed prior to the process control system or plant having knowledgeof the assignment of a field device to a particular I/O card and/orchannel and/or the assignment of a process controller to a particularI/O card and/or channel.

Similarly, with regard to process controllers that implement controlroutines in process plants, I/O virtualization allows for variouscommissioning activities and/or actions related to the controller to beperformed without requiring that all of the components included in acontrol loop to first be installed and interconnected. For example, avirtual I/O object may be generated to simulate, e.g., to a controlroutine, the I/O of a component (e.g., of an I/O device, a field device,etc.) that has not been commissioned yet. Accordingly, at least someportion of the commissioning activities of a controller that implementsa control routine in a control loop may be performed while variouscomponents of the control loop are disconnected or not yet allocated toeach other, to field devices, and/or to the back-end environment. Assuch, respective commissioning activities may be initiated and performedat both the back-end environment and the field environment of a processplant while the two environments are communicatively disconnected oronly partially connected.

Consequently, as I/O virtualization allows for the physical design andengineering performed in the field environment of the process plant toproceed independently of the functional design and engineering performedin the back-end environment of the process plant, and as I/Ovirtualization also allows for piece-wise commissioning of components ofa control loop to be performed independently or on an as-installedbasis, commissioning scheduling dependencies between the back-end andthe field are reduced, and overall calendar time that is required forcommissioning the process plant is also reduced. Thus, I/Ovirtualization optimizes the commissioning process as a whole withsignificant reduction in both time and personnel resources, andtherefore significant reduction in costs.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 depicts a block diagram illustrating an example system processplant, at least a portion of which may be commissioned by utilizing oneor more of the I/O virtualization techniques described herein;

FIGS. 2A-2B illustrate views of example components within a back-endsystem of a process or industrial plant that provides the ability toconfigure and perform commissioning actions on the back-end components,such as modules, applications, and interface programs, including priorto field equipment being connected and/or allocated via I/O networks inthe plant;

FIG. 2C depicts an example system for communicating with virtual devicesignal tags (DSTs) as proxies to field equipment when configuring andcommissioning back-end system components prior to the field equipmentbeing connected and/or allocated via I/O networks in the plant;

FIG. 3 illustrates an example screen display presented by theconfiguration application that includes indications of control routinethat is to be implemented by a controller in the process plant of FIG.1;

FIG. 4 illustrates an example screen display presented by theconfiguration application that provides user control to enablesimulation of a control module of the process plant of FIG. 1;

FIG. 5 illustrates an example screen display presented by a simulationapplication that provides user control to simulate an input value of avirtual DST of the process plant of FIG. 1;

FIG. 6 illustrates an example screen display presented by the simulationapplication that indicates an output of a virtual controller of theprocess plant of FIG. 1; and

FIG. 7 depicts a flow diagram of an example method of virtualizing I/Odevices.

DETAILED DESCRIPTION

As discussed above, a process plant, process control system, or processcontrol environment that, when on-line, operates to control one or moreindustrial processes in real-time may be commissioned utilizing one ormore of the I/O virtualization techniques, systems, apparatuses,components, devices, and/or methods described herein. The process plant,when commissioned and operating on-line, includes one or more wired orwireless process control devices, components, or elements that performphysical functions in concert with a process control system to controlone or more processes executing within the process plant. The processplant and/or process control system may include, for example, one ormore wired communication networks and/one or more wireless communicationnetworks. Additionally, the process plant or control system may includecentralized databases, such as continuous, batch, asset management,historian, and other types of databases.

To illustrate, FIG. 1 is a block diagram of an example process plant,process control system, or process control environment 5, at least aportion of which has been commissioned by using any one or more of theI/O virtualization techniques described herein. The process plant 5includes one or more process controllers (which are also referred tointerchangeably herein as “controllers”) that receive signals indicativeof process measurements made by field devices, process this informationto implement a control routine, and generate control signals that aresent over wired or wireless process control communication links ornetworks to other field devices to control the operation of a process inthe plant 5. Typically, at least one field device performs a physicalfunction (e.g., opening or closing a valve, increasing or decreasing atemperature, taking a measurement, sensing a condition, etc.) to controlthe operation of a process. Some types of field devices communicate withcontrollers by using I/O devices (which are also referred tointerchangeably herein as “I/O cards.” Process controllers, fielddevices, and I/O devices may be wired or wireless, and any number andcombination of wired and wireless process controllers, field devices andI/O devices may be included in the process plant environment or system5.

For example, FIG. 1 illustrates a process controller 11 that iscommunicatively connected to wired field devices 15-22 via I/O cards 26and 28, and that is communicatively connected to wireless field devices40-46 via a wireless gateway 35 and a process control data highway orbackbone 10. The process control data highway 10 may include one or morewired and/or wireless communication links, and may be implemented usingany desired or suitable or communication protocol such as, for example,an Ethernet protocol. In some configurations (not shown), the controller11 may be communicatively connected to the wireless gateway 35 using oneor more communications networks other than the backbone 10, such as byusing any number of other wired or wireless communication links thatsupport one or more communication protocols, e.g., Wi-Fi or other IEEE802.11 compliant wireless local area network protocol, mobilecommunication protocol (e.g., WiMAX, LTE, or other ITU-R compatibleprotocol), Bluetooth®, HART®, WirelessHART®, Profibus, FOUNDATION®Fieldbus, etc.

The controller 11, which may be, by way of example, the DeltaV™controller sold by Emerson Process Management, may operate to implementa batch process or a continuous process using at least some of the fielddevices 15-22 and 40-46. In an embodiment, in addition to beingcommunicatively connected to the process control data highway 10, thecontroller 11 is also communicatively connected to at least some of thefield devices 15-22 and 40-46 using any desired hardware and softwareassociated with, for example, standard 4-20 mA devices, I/O cards 26,28, and/or any smart communication protocol such as the FOUNDATION®Fieldbus protocol, the HART® protocol, the WirelessHART® protocol, etc.In FIG. 1, the controller 11, the field devices 15-22 and the I/O cards26, 28 are wired devices, and the field devices 40-46 are wireless fielddevices. Of course, the wired field devices 15-22 and wireless fielddevices 40-46 could conform to any other desired standard(s) orprotocols, such as any wired or wireless protocols, including anystandards or protocols developed in the future.

The process controller 11 of FIG. 1 includes a processor 30 thatimplements or oversees one or more process control routines 38 (e.g.,that are stored in a memory 32). The processor 30 is configured tocommunicate with the field devices 15-22 and 40-46 and with other nodescommunicatively connected to the controller 11. It should be noted thatany process control routines or modules described herein may have partsthereof implemented or executed by different controllers or otherdevices if so desired. Likewise, the process control routines or modules38 described herein which are to be implemented within the processcontrol system 5 may take any form, including software, firmware,hardware, etc. Control routines may be implemented in any desiredsoftware format, such as using object oriented programming, ladderlogic, sequential function charts, function block diagrams, or using anyother software programming language or design paradigm. The controlroutines 38 may be stored in any desired type of memory 32, such asrandom access memory (RAM), or read only memory (ROM). Likewise, thecontrol routines 38 may be hard-coded into, for example, one or moreEPROMs, EEPROMs, application specific integrated circuits (ASICs), orany other hardware or firmware elements. Thus, the controller 11 may beconfigured to implement a control strategy or control routine in anydesired manner.

The controller 11 implements a process control strategy or controlroutine 38 using what are commonly referred to as function blocks, whereeach function block is an object or other part (e.g., a subroutine) ofan overall control routine and operates in conjunction with otherfunction blocks (via communications called links) to implement processcontrol loops within the process control system 5. Control-basedfunction blocks typically perform one of an input function, such as thatassociated with a transmitter, a sensor or other process parametermeasurement device, a control function, such as that associated with acontrol routine that performs PID, fuzzy logic, etc. control, or anoutput function which controls the operation of some device, such as avalve, to perform some physical function within the process controlsystem 5. Of course, hybrid and other types of function blocks exist.Function blocks may be stored in and executed by the controller 11,which is typically the case when these function blocks are used for, orare associated with standard 4-20 mA devices and some types of smartfield devices such as HART® devices, or may be stored in and implementedby the field devices themselves, which can be the case with FOUNDATION®Fieldbus devices. The controller 11 may include one or more controlroutines 38 that may implement one or more control loops which areperformed by executing one or more of the function blocks.

The wired field devices 15-22 may be any types of devices, such assensors, valves, transmitters, positioners, etc., while the I/O cards 26and 28 may be any types of I/O devices conforming to any desiredcommunication or controller protocol. In FIG. 1, the field devices 15-®are standard 4-20 mA devices or HART® devices that communicate overanalog lines or combined analog and digital lines to the I/O card 26,while the field devices 19-22 are smart devices, such as FOUNDATION®Fieldbus field devices, that communicate over a digital bus to the I/Ocard 28 using a FOUNDATION® Fieldbus communications protocol. In someembodiments, though, at least some of the wired field devices 15, 16 and18-21 and/or at least some of the I/O cards 26, 28 additionally oralternatively communicate with the controller 11 using the processcontrol data highway 10 and/or by using other suitable control systemprotocols (e.g., Profibus, DeviceNet, Foundation Fieldbus, ControlNet,Modbus, HART, etc.).

In FIG. 1, the wireless field devices 40-46 communicate via a wirelessprocess control communication network 70 using a wireless protocol, suchas the WirelessHART® protocol. Such wireless field devices 40-46 maydirectly communicate with one or more other devices or nodes of thewireless network 70 that are also configured to communicate wirelessly(using the wireless protocol or another wireless protocol, for example).To communicate with one or more other nodes that are not configured tocommunicate wirelessly, the wireless field devices 40-46 may utilize awireless gateway 35 connected to the process control data highway 10 orto another process control communications network. The wireless gateway35 provides access to various wireless devices 40-58 of the wirelesscommunications network 70. In particular, the wireless gateway 35provides communicative coupling between the wireless devices 40-58, thewired devices 11-28, and/or other nodes or devices of the processcontrol plant 5. For example, the wireless gateway 35 may providecommunicative coupling by using the process control data highway 10and/or by using one or more other communications networks of the processplant 5.

Similar to the wired field devices 15-22, the wireless field devices40-46 of the wireless network 70 perform physical control functionswithin the process plant 5, e.g., opening or closing valves, or takingmeasurements of process parameters. The wireless field devices 40-46,however, are configured to communicate using the wireless protocol ofthe network 70. As such, the wireless field devices 40-46, the wirelessgateway 35, and other wireless nodes 52-58 of the wireless network 70are producers and consumers of wireless communication packets.

In some configurations of the process plant 5, the wireless network 70includes non-wireless devices. For example, in FIG. 1, a field device 48of FIG. 1 is a legacy 4-20 mA device and a field device 50 is a wiredHART® device. To communicate within the network 70, the field devices 48and 50 are connected to the wireless communications network 70 via awireless adaptor 52 a, 52 b. The wireless adaptors 52 a, 52 b support awireless protocol, such as WirelessHART, and may also support one ormore other communication protocols such as Foundation® Fieldbus,PROFIBUS, DeviceNet, etc. Additionally, in some configurations, thewireless network 70 includes one or more network access points 55 a, 55b, which may be separate physical devices in wired communication withthe wireless gateway 35 or may be provided with the wireless gateway 35as an integral device. The wireless network 70 may also include one ormore routers 58 to forward packets from one wireless device to anotherwireless device within the wireless communications network 70. In FIG.1, the wireless devices 40-46 and 52-58 communicate with each other andwith the wireless gateway 35 over wireless links 60 of the wirelesscommunications network 70, and/or via the process control data highway10.

In FIG. 1, the process control system 5 includes one or more operatorworkstations 71 that are communicatively connected to the data highway10. Via the operator workstations 71, operators may view and monitorrun-time operations of the process plant 5, as well as take anydiagnostic, corrective, maintenance, and/or other actions that may berequired. At least some of the operator workstations 71 may be locatedat various, protected areas in or near the plant 5, and in somesituations, at least some of the operator workstations 71 may beremotely located, but nonetheless in communicative connection with theplant 5. Operator workstations 71 may be wired or wireless computingdevices.

The example process control system 5 is further illustrated as includinga configuration application 72 a and configuration database 72 b, eachof which is also communicatively connected to the data highway 10. Asdiscussed above, various instances of the configuration application 72 amay execute on one or more computing devices (not shown) to enable users(e.g., configuration engineers) to create or change process controlmodules and download these modules via the data highway 10 to thecontrollers 11, to generate a virtual controller representative of theone of the controllers 11 for a simulation or test of draft processcontrol modules, as well as enable users to create or change operatorinterfaces via which in operator is able to view data and change datasettings within process control routines. The configuration database 72b stores the created (e.g., configured) modules, including templatemodules, control modules, display modules, and/or operator interfaces.Generally, the configuration application 72 a and configuration database72 b are centralized and have a unitary logical appearance to theprocess control system 5, although multiple instances of theconfiguration application 72 a may execute simultaneously within theprocess control system 5, and the configuration database 72 b may beimplemented across multiple physical data storage devices. Accordingly,the configuration application 72 a, configuration database 72 b, anduser interfaces thereto (not shown) comprise a configuration ordevelopment system 72 for control and/or display modules. Typically, butnot necessarily, the user interfaces for the configuration system 72 aredifferent than the operator workstations 71, as the user interfaces forthe configuration system 72 are utilized by configuration anddevelopment engineers irrespective of whether or not the plant 5 isoperating in real-time, whereas the operator workstations 71 areutilized by operators during real-time operations of the process plant 5(also referred to interchangeably here as “run-time” operations of theprocess plant 5).

The example process control system 5 includes a data historianapplication 73 a and data historian database 73 b, each of which is alsocommunicatively connected to the data highway 10. The data historianapplication 73 a operates to collect some or all of the data providedacross the data highway 10, and to historize or store the data in thehistorian database 73 b for long term storage. Similar to theconfiguration application 72 a and configuration database 72 b, the datahistorian application 73 a and historian database 73 b are centralizedand have a unitary logical appearance to the process control system 5,although multiple instances of a data historian application 73 a mayexecute simultaneously within the process control system 5, and the datahistorian 73 b may be implemented across multiple physical data storagedevices.

In some configurations, the process control system 5 includes one ormore other wireless access points 74 that communicate with other devicesusing other wireless protocols, such as Wi-Fi or other IEEE 802.11compliant wireless local area network protocols, mobile communicationprotocols such as WiMAX (Worldwide Interoperability for MicrowaveAccess), LTE (Long Term Evolution) or other ITU-R (InternationalTelecommunication Union Radiocommunication Sector) compatible protocols,short-wavelength radio communications such as near field communications(NFC) and Bluetooth, or other wireless communication protocols.Typically, such wireless access points 74 allow handheld or otherportable computing devices (e.g., user interface devices 75) tocommunicate over a respective wireless process control communicationnetwork that is different from the wireless network 70 and that supportsa different wireless protocol than the wireless network 70. For example,a wireless or portable user interface device 75 may be a mobileworkstation or diagnostic test equipment that is utilized by an operatorwithin the process plant 5 (e.g., an instance of one of the operatorworkstations 71). In some scenarios, in addition to portable computingdevices, one or more process control devices (e.g., controller 11, fielddevices 15-22, or wireless devices 35, 40-58) also communicate using thewireless protocol supported by the access points 74.

In some configurations, the process control system 5 includes one ormore gateways 76, 78 to systems that are external to the immediateprocess control system 5. Typically, such systems are customers orsuppliers of information generated or operated on by the process controlsystem 5. For example, the process control plant 5 may include a gatewaynode 76 to communicatively connect the immediate process plant 5 withanother process plant. Additionally or alternatively, the processcontrol plant 5 may include a gateway node 78 to communicatively connectthe immediate process plant 5 with an external public or private system,such as a laboratory system (e.g., Laboratory Information ManagementSystem or LIMS), an operator rounds database, a materials handlingsystem, a maintenance management system, a product inventory controlsystem, a production scheduling system, a weather data system, ashipping and handling system, a packaging system, the Internet, anotherprovider's process control system, or other external systems.

It is noted that although FIG. 1 only illustrates a single controller 11with a finite number of field devices 15-22 and 40-46, wireless gateways35, wireless adaptors 52, access points 55, routers 58, and wirelessprocess control communications networks 70 included in the exampleprocess plant 5, this is only an illustrative and non-limitingembodiment. Any number of controllers 11 may be included in the processcontrol plant or system 5, and any of the controllers 11 may communicatewith any number of wired or wireless devices and networks 15-22, 40-46,35, 52, 55, 58 and 70 to control a process in the plant 5.

Further, it is noted that the process plant or control system 5 of FIG.1 includes a field environment 122 (e.g., “the process plant floor 122”)and a back-end environment 125 which are communicatively connected bythe data highway 10. As shown in FIG. 1, the field environment 122includes physical components (e.g., process control devices, networks,network elements, etc.) that are disposed, installed, and interconnectedtherein to operate to control the process during run-time. For example,the controller 11, the I/O cards 26, 28, the field devices 15-22, andother devices and network components 40-46, 35, 52, 55, 58 and 70 arelocated, disposed, or otherwise included in the field environment 122 ofthe process plant 5. Generally speaking, in the field environment 122 ofthe process plant 5, raw materials are received and processed using thephysical components disposed therein to generate one or more products.

The back-end environment 125 of the process plant 5 includes variouscomponents such as computing devices, operator workstations, databasesor databanks, etc. that are shielded and/or protected from the harshconditions and materials of the field environment 122. Referring to FIG.1, the back-end environment 125 includes, for example, the operatorworkstations 71, the configuration or development systems 72 for controlmodules and other executable modules, data historian systems 73, and/orother centralized administrative systems, computing devices, and/orfunctionality that support the run-time operations of the process plant5. In some configurations, various computing devices, databases, andother components and equipment included in the back-end environment 125of the process plant 5 may be physically located at different physicallocations, some of which may be local to the process plant 5, and someof which may be remote.

FIG. 2A illustrates an example back-end system 200 that includeshardware and software entities that enable back-end system components(e.g., and in particular, those back-end components related to processcontrollers) to be created, tested, configured and commissioned (atleast partially) prior to the field equipment being connected to and/orallocated to various I/O network cards and/or channels in the plant. Theback-end system 200 may be included in the back-end environment 125 ofFIG. 1, in an example implementation.

More particularly, as illustrated in FIG. 2A, the back-end system 200may include control, maintenance, and simulation systems, depicted as acontrol system 210, an asset management system (AMS) 212, and asimulation system 214. The control system 210, which is illustrated forthe sake of simplicity as a single block, may include many differentcontrol applications and databases stored in and executed in the same ordifferent control system processing devices, such as in the variousdifferent processing devices, user workstations, servers, and databasesof FIG. 1. More particularly, the control system 210 may include one ormore control system design applications 210A, such as a configurationapplication, which may be used to create various control modules,control function blocks, control user interface applications, and othercontrol programs (e.g., as illustrated in FIG. 2A and as generallyreferred to herein as control modules 210B). As the control applications210A may be used to facilitate commissioning activities, any of thecontrol applications 210A, including the configuration application, mayalso be referred to as a “commissioning tool.” The control modules 210Bthat are generated and/or modified by using the control applications210A may ultimately be downloaded, stored, and executed in one or moreprocess controllers or safety system logic devices in the fieldenvironment 122. When executing in the one or more process controllersor safety logic devices in the field environment 122 during runtime, thecontrol modules 210B may perform control routines to implement controlactions, safety system routines to implement safety actions, etc. Thecontrol user interface applications, which may be executed in one ormore back-end system computer devices, such as workstations having userinterfaces, etc., may enable control engineers, control operators, orother personnel to perform various control based activities in theplant. Once created, such control modules, routines, applications, andprograms 210B may be downloaded to and executed in various ones of thecontrollers, I/O devices, field devices, databases, user interfacedevices, servers, processing devices, etc., of the field environment 122of the control system during runtime of the process plant 5.Additionally or alternatively, the control modules, routines,applications, and programs may be executed by a virtual controller in asimulation environment at the simulation system 214. Moreover, thecreated control modules 210B (which may be made up of variousinterconnected function blocks, for example), safety instrumentedmodules, user interface modules, communication modules, analyticmodules, database modules, etc., may be stored in a configurationdatabase 216 (not shown). At some point, these control modules,programs, interfaces, etc., 210B may also be downloaded and installed invarious computer processing devices, such as in process controllers,workstations, user interface devices, databases, servers, etc. duringthe commissioning process.

Likewise, the asset management system (AMS) 212 may include variousmaintenance system creation and configuration applications 212A whichare used to create maintenance systems objects, user interfaces,database objects, or other applications or modules 212B, which may bestored in and executed in various devices in the plant to performmaintenance activities in the plant, including in user workstationdevices, handheld devices, portable computing devices, etc. The modules,objects, programs, and applications 212B may be run by or in conjunctionwith other maintenance system components, and may be run on variousplatforms or devices, such as back-end system devices, handheld orportable devices that can be moved within the plant, etc. Moreover,these modules, applications, programs, interfaces, etc., may be used toperform any desired or known types of maintenance activities on thedevices within the process or industrial plant, including on devices inthe control system and the safety instrumented system of the plant. Asillustrated in FIG. 2A, the components of the AMS system 212 may beconnected to and may store information and receive information from theconfiguration database 216, and may operate to update or change data,objects, or other information in the configuration database 216 duringoperation of the plant.

Still further, the back-end environment 200 of FIG. 2A is illustrated asincluding a simulation system 214 that may include various applications214A that may be used to test various ones of the control modules 210B,safety modules 210B, communication modules 210B, asset management systemmodules 212B, user interface applications 210A and 212A, etc. that aredeveloped using applications 210A and 212A within the control system210, and the AMS 212, and/or that are stored in the configurationdatabase 216. In some cases, the simulation system applications 214A maybe used to create a simulation environment for executing a virtualcontroller to test and develop control modules and/or control routinesas part of the commissioning of the control modules 210B and/or of theirrespective controllers 262. In FIG. 2A, the simulation components thatare created by using the simulation system applications 214A (such asthe simulation environment, the one or more virtual controllers, etc.)are indicated by the references 214B.

To enable commissioning activities to be performed on the software andhardware components of the back-end environment 200 prior to theback-end environment 200 being fully communicatively connected to thefield equipment, and/or prior to the I/O network being configured toprovide communication paths between the back-end environment 200 and thefield equipment, the back-end environment 200 includes an asset objectsystem 230 that, as illustrated in FIG. 2B, is communicatively connectedto the control system 210, the AMS 212, the simulation system 214, andthe configuration database 216. In some cases, the asset object system230 may be part of the configuration database 216, e.g., may beimplemented integrally with the configuration database 216. The assetobject system 230 stores various device placeholder objects 232 therein,and generally stores such a device placeholder object 232 m for eachpiece of field equipment in the field environment (e.g., each fielddevice). The device placeholder objects for field devices or otherpieces of hardware are generally indicated as a device tag (DT)placeholder object 232 m. Additionally, the asset object system 230 maystore a device placeholder object for each different signal oraddressable parameter of a device, and these device placeholder objectsare generally indicated as a device signal tag (DST) object 232 n. A DSTobject 232 n may use the same device tag as the device tag of a deviceto which the device signal tag corresponds as a root tag, withadditional or other information included therein. Thus, the device tag232 n for a DST object may include the device tag 232 m for the DTobject to which the signal belongs, with additional signal taginformation concatenated thereto, for example.

Generally speaking, a device placeholder object 232 is created for eachof the same devices (and device signals where appropriate) as created inthe field equipment environment 122 described above. Thus, the deviceplaceholder objects 232 in the back-end environment 200 have the sameformat and the same types of information stored therein as deviceobjects that are loaded in the field equipment environment 122 (wheresuch verified device objects may be stored in back-end system 200 in theconfiguration database 216, for example, as objects 210B, and may bedownloaded into the field environment 122 therefrom). At any rate, thedevice placeholder objects 232 (or instances thereof) may store I/Ocommunication channel information, such as I/O channel properties whichmay be definitions, parameters, I/O device types, I/O devices, etc.,that are used to communicatively connect the field device to theback-end system 200 and/or to a process controller or other devicedisposed in the field environment 122.

Additionally, the I/O channel properties stored in the deviceplaceholder objects 232 may be used in a simulation executed by thesimulation system 214. To this end, the I/O channel information for thefield device as stored in a device placeholder object 232 provides thesimulation system 214 with the ability to replicate, use, and test adevice placeholder object (or an instance thereof) without the deviceplaceholder object 232 being assigned to a particular I/O channel. Ofcourse, the simulation system 214 still is able to replicate, use, andtest device placeholder objects 232 that have been assigned toparticular I/O channels.

Thus, the created objects, modules, applications, and programs 210B,212B, 214B, that require or involve sending signals to or receivingsignals from one or more of the field devices in the plant 5 may becreated (as is typical) in the control system configuration applications210A, in the maintenance system configuration applications 212A, and inthe simulation system creation applications 214A, using the system tagof the field device and/or the device signal tag (which refers to aspecific signal or parameter of a field device using the system tag ofthe field device). Typically, system tags, device tags, and/or devicesignal tags of field devices may be stored in the back-end system 200 inthe AMS system 212 and/or in the control system 210, e.g., in theconfiguration database 216. A user may then use the control,maintenance, and simulation system applications 210A, 212A, 214A or astand-alone simulation or configuration application to configure andexecute the modules, objects, applications, and programs 210B, 212B,214B, which, during execution, may use the device system tag (and/ordevice signal tag based on the device system tag) stored in the back-endsystem 200 to locate the device placeholder object 232 in the assetobject system 230 for a referenced device or device signal. When thedevice placeholder object 232 as stored in the asset object system 230is indicated to be in an I/O-unallocated state, the control system 210,the maintenance system 212, the simulation system 214, or othersimulation or testing engine recognizes that the actual field device isnot connected to the back-end system 200 via the control system I/Ocommunications network. However, in these cases, the device placeholderobject 232 may still store information about the device (and/or the I/Opath or channel needed to reach the device via the I/O network) that isneeded by or being referenced by the calling module, application, orprogram and so the device placeholder object 232 may provide a responseor be used to provide a response based on the configuration data storedwithin the device placeholder object 232 to mimic the operation of thedevice or the response of the actual device, or to indicate whether thecall is properly configured based on the device and I/O channelinformation stored about the device being addressed.

To this end, when a device placeholder object 232 is created, the deviceplaceholder object 232 may be assigned default parameters for the typeof object with which the device placeholder object is associated. Forexample, the configuration database 216 stores template objects fordevice objects made available to the applications 210A, 212A, and 214A.The template object includes the default parameters for that objecttype. In some embodiments, the asset object system 230 creates a copy ofthe template object to create the device placeholder object 232 suchthat the device placeholder object includes the default parameters.

In other cases, the control application 210A, the maintenanceapplication 212A, the simulation application 214A, or a separateexecution engine in, for example, the asset object system 230, uponrecognizing from the device placeholder object 232 that the field deviceis in an I/O-unallocated device state, may create a simulated responsefrom the field device to provide a known signal back to the requestingobject to enable testing and simulation of the requesting object as ifthe field device were actually connected to the back-end environment 200via the control system I/O network.

FIG. 2B illustrates a back-end system 200 having the various back-endfunctional systems of FIG. 2A interconnected together via one or morebusses or communication networks 260 and, in particular, includes thecontrol system 210, the asset management system 212, the simulationsystem, the configuration database 216, and the asset object systemdatabase 230 connected to the communication bus 260, which may beimplemented using any one or more types of communication networks, suchas a wired or wireless Ethernet connection, etc. Additionally, one ormore process controllers 262 (which may include, for example, theprocess controller 11 of FIG. 1) are illustrated as being connected tothe bus 260. The controllers 262 are illustrated in FIG. 2B as beingconnected through an I/O network 263 to various field devices or fieldassets 264. However, it should be noted that the I/O network 263 may notbe connected to the controllers 262 during the commissioning process, orwhile the I/O network 263 may be connected to the controllers 262, theI/O network 263 may not yet be configured or allocated. Thus, thecontrollers 262 may have no understanding or indication of how to accessa particular field device or field asset 264 via the I/O network 263(e.g., because the signal path through the I/O network 263 to each suchfield device 264 has not yet been established or allocated). Similarly,the controllers 262 may not be able to communicate with the fielddevices via a configured signal path because the field devices 264 maynot yet be physically connected to the I/O network 263. Thus, while theI/O network 263 and the field devices 264 are illustrated in FIG. 2B,the I/O network 263 may not actually be connected to the controllers 262and/or ones of the various field devices 264 may not be connected to theI/O network 263 during some of the commissioning activities occurring inthe back-end system 200.

Additionally, a configuration application 210A enables a configurationengineer to implement a virtual controller 214B in the simulation system214. To this end, the configuration application 210A analyzes anycontrol modules 210B assigned to the controller that is to bevirtualized to identify any I/O objects, such as a DT 232 m and/or a DST232 n, included in control routine. For each of these I/O objects, theconfiguration application 210A generates a respective virtual I/O object234 m, 234 n that is stored in the back-end system 200, e.g., at theconfiguration database 216. When the configuration application 210Aestablishes the virtual controller simulation 214B in the simulationsystem 214, the configuration application 210A replaces any reference inthe control modules 210B to the physical location of the I/O object 232m, 232 n with a reference to the location of the corresponding virtualI/O object 234 m, 234 n. It should be noted that non-I/O parameters ofthe modules may still reference the physical path, in some embodiments.

As will be appreciated, the I/O objects 232 m, 232 n may be assigned tofield devices that have an allocated or an unallocated I/O path.Additionally, in some control routines, the I/O device (e.g., the I/Ocard or other suitable hardware supporting the I/O objects 232 m, 232 n)may be unassigned from any field device 264. For I/O devices assigned toa field device 264 with an allocated I/O path, the configurationapplication 210A may generate the virtual I/O object 234 by copying acorresponding DT object or a DST object that is configured, stored inthe configuration database 216, and corresponds to the assigned fielddevice 264. On the other hand, for an I/O device assigned to a fielddevice without an allocated I/O path or are unassigned to a device atall, the configuration application 210A may generate the virtual I/Oobject 234 by copying a device placeholder object 232 stored in theasset object system 230 to correspond to the yet-to-be-assigned fielddevice 264. Alternatively, in either case, the configuration application210A may generate the virtual I/O object 234 by copying a templateobject stored in the configuration database 216. It should beappreciated that because the references to the virtual I/O objects 234are only included in the control modules 210B when implementing avirtual controller 214B, upon successful testing of subject controlmodules 210B via the simulation system 214, the same control module 210Bcan be downloaded into a controller 262 without modification.

Additionally, as illustrated in FIG. 2B, the various systems 210, 212,and 214 include configuration applications such as control applicationsor control module creation applications 210A, maintenance object orinterface creation applications 212A, and simulation system applications214A, which may be used during commissioning of the plant or to createvarious ones of the modules, objects, applications, and/oruser-interface programs 210B, 212B, 214B, which will be downloaded toand potentially run in various computing devices either within theback-end system 200, such as any of those shown in FIG. 1, or which maybe provided to one of the controllers 262 (or safety system logicsolvers not shown) or other devices, for execution during the operationof the plant 5 when the plant 5 is operating online, i.e., after theplant 5 has been commissioned.

As will be understood, the asset object system or database 230 storesthe device placeholder objects 232 for each of the field device assets264, and thus provides configuration information about these objects tothe other systems 210, 212, 214 when these placeholder objects are in anVO-unallocated device state. Similarly, the virtual I/O objects 234stored at the configuration database 216 also provide configurationinformation about the field device assets 264. The use of the deviceplaceholder objects 232 and/or virtual I/O objects 234, enables theother applications, such as the programs 210A, 212A, 214A, to completevarious commissioning and testing activities on the objects, modules,applications, and programs 210B, 212B, 214B prior to the field devices264 actually being connected or allocated through the I/O network 263 tothe various controllers 262. For example, some testing activities may beconducted by a virtual controller 214B that implements the controlmodules 210B assigned to a controller 262.

Once the device placeholder objects 232 and/or virtual I/O objects 234are configured, at least to some degree, for example, with suchinformation as a device system tag, device type, and varioussub-information that may be determined or based on the device type(including such sub-information provided by a user), and/or with I/Ochannel information pertaining to the I/O channel which will be used tocommunicate with the field device 264, the various other applications210A, 212A, 214A, may use these device placeholders objects 232 and/orvirtual I/O objects 234 as proxies for communicating with the actualfield devices 264 or with signals within the field devices 264. Thus,the device placeholder objects 232 and/or virtual I/O objects 234 serveas proxies for the actual field devices 264 and, during thecommissioning process or testing process, the other applications, suchas the control, maintenance, and simulation applications 210A, 212A,214A, which may communicate with the device placeholder objects 232 orvirtual I/O objects 234 (using system, device, or device signal tags)instead of trying to communicate with the actual field devices 264 viathe I/O network 263. This feature enables the applications 210A, 212A,214A, to test the control modules created thereby using the onlyinformation they will have during online operation of those applications(i.e., the device system tag and/or the device signal tag) to performtesting, configuration, simulation, and various other commissioningactivities prior to the field devices 264 being connected to the controlsystem and allocated via the I/O network 263.

FIG. 2C illustrates a simulation or testing system 270 that may operatein conjunction with one of the control applications 210A used tosimulate or test the operation of one or more control modules 210B via avirtual controller 236, to thereby enable testing of control objects ormodules 210B in the back-end environment 125 or back-end system 200prior to those modules or objects being downloaded to a controller 262in the field environment 122 (or to one or more field devices 264 to beconnected to a controller 262 responsible for the control module beingtested). In particular, the system 270 of FIG. 2C is illustrated asexecuting and testing a control module 210B made up of a set ofinterconnected function blocks 272 a, 272 b, 272 c, interconnected withcommunication links, with the control module 210B being part of thecontrol system 210. Additionally or alternatively, the system 270executes and tests other modules, applications, programs, objects, etc.,associated with other systems in the back-end system 200, such as theasset management system 212 and the simulation system 214.

In any event, the system 270 includes an execution engine 280 that, inturn, executes each of the function blocks 272 a-272 c of the controlmodule 210B and provides communications between these function blocks272 a-272 c as defined by the communication links. It should be notedthat the execution engine 280 can be a computer processing device thatimplements any one of the applications 210A, 212A, 214A, or a processorrunning a dedicated simulation or testing application designed forcommissioning purposes (which may be different than the simulationapplications 214A). Thus, the execution engine 280 may be part of thecontrol system 210, the asset management system 212, the simulationsystem 214, etc., or the execution engine 280 may be a stand-alonecomponent designed or dedicated to implementing testing andcommissioning activities. Moreover, the execution engine 280 may beimplemented anywhere (in any desired computing device) in the back-endsystem 200 as long as the execution engine 280 is communicativelycoupled to the asset object system 230 and the database 216.

In any event, during the execution of a particular function block 272that requires communication with a field device or other field asset,the execution engine 280 calls or uses a communication interface 282 tointerface with the field device using, for example, a system tag of thefield device (which is common for control, maintenance, and simulationmodules). As described above, when implementing the virtual controller236, the configuration application 210A configures any reference by oneof the function blocks 272 a-272 c to a DT or DST to a reference to arespective virtual I/O object 234 stored in the configuration database216. Thus, the execution engine 280 uses the communication path for thevirtual I/O object 234 to execute a reference to an I/O device includedin the control module 210B.

To this end, the execution engine 280 does not know (or need to know,for that matter) the communication path (i.e., the I/O network path)needed to reach the field device 264 in the field environment 122 and/orwhether or not the path has or has not yet been commissioned. Rather,the execution engine 280, via the communication interface 282, sends arequest (e.g., to the configuration database 216) to accessconfiguration information and/or the I/O channel for the field devicevia its virtual I/O object 234. The communication interface 282retrieves that desired or needed information stored at the virtual I/Oobject 234 and provides that information back to the execution engine280. In some cases, the device virtual I/O object 234 may storeconfiguration information associated with or defining the actual fielddevice, such as device type, source (long) tag, system (short) tag,device ranges, limits, capabilities, etc. In the case in which therequested information is actually stored in the virtual I/O object 234,this information may be returned from the virtual I/O object 234 as ifit were from the field device 264 itself.

Still further, in some cases, the communication interface 282 may justdetermine if the requested communications from control module 210B matchor conform to the proper protocol or device configuration of the deviceor the I/O channel for the device associated with the virtual I/O object234. This determination still enables the commissioning personnel todetermine if the control module 210B is configured correctly tocommunicate with a particular device based on device type, deviceconfiguration parameters, I/O channel configuration parameters, etc. asstored within the virtual I/O object 234.

In other instances, however, the requested field device data may relateto non-configuration data collected by or generated by the field devicebased on actual operation of the field device. Accordingly, thecommunication interface 282 may access a simulation response block ormodule of the virtual I/O object 234 that may provide a simulatedresponse for the field device to simulate the operation of the fielddevice. The simulation response block or module may be specific to thecommissioning process and may be provided as part of generating thevirtual I/O object 234. In some cases, the simulation block of thevirtual I/O object 234 is provided default simulation values when thevirtual I/O object 234 is created. Such simulated responses may beprovided by a user or a testing system, may be stored in a simulationfile created for testing and commissioning purposes, may be generated onthe fly by a user interfacing with a simulation application 214A, or maybe provided in other manners. This simulated device response (which maybe a simulated value for a device state, a device measurement, a deviceparameter, etc.) is provided to the execution engine 280 as if thisvalue were a value or signal returned from the field device itself. Thissimulated response thereby enables further testing of the control module210B based on predefined device responses. Generally speaking, thesimulation block may be configured to make the virtual I/O object 234look like a smart object or appear to be capable of providing actualdevice responses back to the requesting module (i.e., the module 210Bbeing tested). In other cases, the communication interface 282 uses thesimulation block of the virtual I/O object 234 to mimic operation of thedevice defined by the virtual I/O object 234 in some known manner fortesting or simulation purposes.

In some cases, such as when at least a portion of the communication path(i.e., the I/O network path) needed to reach the field device 264 in thefield environment 122 has been commissioned and/or defined (e.g., asindicated by the status of the field device's respective deviceplaceholder object 232), the virtual I/O object 234 obtains the neededfield device information at least in part directly from the commissionedportion of the I/O network path 263, and returns the information to theexecution engine 280.

Of course, the back-end system 200 described with respect to FIGS. 2A-2Cmay include more, less, and/or alternate functionality, such as thefunctionality described in PCT Application Number PCT/US2016/056610,filed May 18, 2017, entitled “AUTOMATIC DISTRIBUTION OF DEVICEPARAMETERS FOR COMMISSIONING PORTIONS OF A DISCONNECTED PROCESS CONTROLLOOP,” the entire disclosure of which is hereby expressly incorporatedby reference.

FIG. 3 illustrates an example screen display 302 presented by theconfiguration application that includes indications of a control routine(e.g., a control routine 210B) that is to be implemented by a controllerin the process plant 5 of FIG. 1, e.g., the controller 11 or 262. In oneexample, the configuration application is one the configurationapplications 72 a of the back-end environment 125 of FIG. 1 and/or acontrol application 210A of the control system 210 of the back-endsystem 200 of FIG. 2.

The configuration application includes a library of template objects,such as function block template objects and, in some cases, controlmodule template objects. These configuration applications are used toconfigure a control routine of a control module that is to beimplemented at (e.g., executed by) a controller of the process plantduring runtime. The template objects have default parameters, settingsand methods associated therewith. The engineer using the configurationapplication can select these template objects and essentially placecopies of the selected template objects into a configuration screen todevelop a control module. During the process of selecting and placingthe template objects into the configuration screen, the engineerinterconnects the inputs and outputs of these objects and changes theirparameters, names, tags and other properties to create a specificcontrol module to execute a control routine in the process plant.

In the illustrated example, the control module includes four functionblocks, a first analog input (AI) block 311, a second AI block 312, ananalog output (AO) block 313, and a PID control block 315. In theillustrated control routine, the output of the first AI block 311 isinterconnected to input of the FF_VAL parameter of the PID block 315;the output of the second AI block 312 is interconnected to the input ofthe IN parameter of the PID block 315; and the OUT parameter of the PIDblock 315 is interconnected to the CAS_IN parameter of the AO block 313.It should be appreciated that the engineer may assign a controller anynumber of control modules that implement respective control routines.

After setting up or creating the control routine for a control module,the engineer may store the created control module in the library or in aconfiguration data storage area, such as the configuration database 216of FIGS. 2A-2B. The engineer can then instantiate the control module(e.g., cause an executable file corresponding to the control module tobe created) and download it to the appropriate controller orcontrollers, field devices, and other process elements for executionduring operation of the process plant. However, as described herein,during the commissioning of the process plant, the communication pathbetween the back-end environment 125, 200 and the controller thatimplements the designed control routine may be disconnected.Accordingly, using at least some of the novel techniques describedherein, the configuration application enables the engineer to executeeach control module (that is to be implemented by a physical controllerduring runtime) at a virtual controller in a simulation environment,such as one executing at the simulation system 214 of FIGS. 2A, 2B e.g.,for testing and/or verification purposes.

To this end, the configuration application provides a user control 320to modify the properties of the controller that implements the designedcontrol module to indicate the virtual controller (and not the physicalcontroller). FIG. 4 illustrates an example screen display 402 presentedby the configuration application in response to a user input to modifycontroller properties via the user control 320. In one example, theengineer clicks the user control 320 presented by the screen display 302to cause the configuration application to present the screen display402.

The screen display 402 includes one or more user controls to configureand/or select a virtual controller. For example, a user control 422enables the engineer to select a type of virtual controller to implementthe simulation of the control routine. For example, the user control 422enables the engineer to select the model for the virtual controller anda software version for that model. Additionally, the screen displayincludes a user control 424 that enables the engineer to toggle betweendownloading the control routine into a physical controller and executingthe control routine at the virtual controller.

After the configuration application generates the virtual controllerindicated by the configuration engineer via the screen 402, the engineercan simulate the various inputs into the control module, e.g., fortesting and verification purposes. To this end, the engineer launches asimulation application to test the subject control module executed bythe virtual controller. The simulation application may be one of thesimulation applications 214A of the simulation system 214 of theback-end system 200 of FIG. 2. In one example, the configurationapplication includes an interface to launch the simulation application.In another example, the simulation application is a standaloneapplication executed at, for example, a workstation 71 of the back-endsystem 125 of FIG. 1.

FIG. 5 illustrates an example screen display 500 presented by asimulation application that provides user control to simulate an inputvalue of a virtual DST of the process plant 5 of FIG. 1. The simulationapplication may include an inputs tab that lists all virtual DSTsincluded in the one or more control modules implemented by a virtualcontroller that correspond to input devices. In the illustrated example,the virtual controller implements control modules that include fivedifferent virtual DSTs corresponding to various input devices. It shouldbe appreciated that if multiple control modules controlled by thevirtual controller include the same DST, the virtual DST is only listedonce.

For each of the listed virtual DSTs, the screen display 500 includes anindication of the device to which the virtual DST corresponds (reference502), an indication of a control module implemented by the virtualcontroller that references the virtual DST (reference 504), anindication of the signal parameter corresponding to the virtual DST(reference 506), an indication of a simulation value for the virtual DST(reference 508), an indication of a status of the virtual DST (reference510), and an indication of an output value for the device to which thevirtual DST corresponds (reference 512). In one example, each of thevalues is populated based upon data included in the virtual DST objectstored in the configuration database 216 of FIGS. 2A and 2B. It shouldbe appreciated that the indications of the output values may not bepopulated until the simulation is actually executed.

The screen display 500 further includes one or more user controls toenable the engineer to simulate input values for the listed virtualDSTs. A user control 518 enables the engineer to set a value for theselected input virtual DST. While the user control 518 is illustrated asa text box, the user control 518 may be any type of user interfaceelement that enables an engineer to indicate an input value, such as adrop down box or a radio selection element. In some embodiments, thevirtual DSTs are assigned default simulation parameters when the virtualDST is generated. Additionally, a user control 520 enables thesimulation application 520 to receive an indication to launch thesimulation based on the input value for the virtual DST set via the usercontrol 518.

When the engineer selects the user control 520, the simulationapplication executes the control modules implemented by the virtualcontroller. To this end, the simulation application writes the valueinput via the user control 518 to the virtual DST object for theselected virtual DST stored at the configuration database 216 of FIGS.2A-2B. As described earlier herein, when the configuration applicationgenerated the virtual controller, the configuration application replacedreferences to DSTs with references to the virtual DSTs. Accordingly,when the simulation application writes the input value to the virtualDST object, the control routines respond to input as if the DST hadproduced the input value. Accordingly, the simulation in the back-endenvironment 125 produces the same errors and warnings that would begenerated if the control modules were implemented by a controller in arun-time environment 122.

FIG. 6 illustrates an example screen display 600 presented by thesimulation application that indicates an output of a virtual controllerof the process plant of FIG. 1. The simulation application may includean outputs tab that lists all virtual DSTs included in the controlmodules implemented by the virtual controller that correspond to outputdevices. In the illustrated example, the controller implements controlmodules that include one DST associated with output devices.

For each of the listed virtual DSTs, the screen display 600 includes anindication of the device to which the virtual DST corresponds (reference602), an indication of a control module implemented by the virtualcontroller that references the virtual DST (reference 604), anindication of the signal parameter corresponding to the virtual DST(reference 606), an indication of an output value for the virtual DST(reference 608), and an indication of a status of the virtual DST(reference 610). In one example, each of the values is populated basedupon data included in the virtual DST object stored in the configurationdatabase 216 of FIGS. 2A-2B.

FIG. 7 depicts a flow diagram of an example method 700 for testing orverifying a control routine in a process plant 5. The method 700 may beexecuted on an operator workstation 71, server, or any other suitablecomputing device of a back-end environment, such as the back-endenvironment 125 of FIG. 1 or back-end environment 200 of FIGS. 2A-2B. Insome embodiments, the method 700 may be implemented in the configurationapplication 72 b, 210A stored on a non-transitory computer-readablememory and executable on one or more processors of the operatorworkstation 71, server, or any other suitable computing device. Forexample, the configuration application 72 may be a configurationapplication 210A of the control system 210 of FIGS. 2A-2B.

At block 702, the method 700 includes receiving an indication of acontrol routine or a control module that is to be implemented by aphysical controller 11 in the field environment 122. In one embodiment,the configuration application 72 presents the display screen 300 toenable an engineer to design the control routine or module. To this end,the configuration application 72 a, 201A enables the engineer to assignand interconnect various function blocks of the control routine ormodule. In some embodiments, the configuration application 72 mayreceive an indication of multiple control routines implemented bymultiple control modules that are to be controlled by the same physicalcontroller 11 during runtime.

At block 704, the method 700 may include receiving a request to simulatethe physical controller 11 that is to execute the indicated controlroutine(s) and/or control module(s), e.g., by using a virtual controller236. In one example, the request is received via a controller propertiesinterface presented within the configuration application 72 a, 210A,such as the display screen 400 of FIG. 4. In some embodiments, therequest includes information detailing a desired software version of thevirtual controller 236 and/or a particular environment at a simulationsystem on which to execute the virtual controller 236.

At block 706, the method 700 may include generating one or morerespective virtual I/O objects 234 for one or more DTs and/or DSTsutilized in (e.g., referenced by) the created control routine or controlmodule. In an embodiment, the configuration application 72 a, 210Ainterfaces with a configuration database 216 to generate a respectivevirtual I/O object 234 for each DT/DST included in the control routineor module. To generate a virtual I/O object 234, the configurationapplication 72 may first determine whether the respective DT/DST isassigned to a field device with an allocated I/O path, assigned to afield device with an unallocated I/O path, or not assigned to a fielddevice at all. For a DT/DST that is assigned to a field device having anallocated I/O path, the configuration database 216 may include a definedor configured DT/DST object that is representative of the DT/DST.Accordingly, in these types of scenarios, to generate the virtual I/Oobject 234 for a field device with an allocated I/O path, theconfiguration application 72 a, 210A copies the DT/DST object stored inthe configuration database 216 into the respective virtual I/O object234.

On the other hand, DTs/DSTs that are assigned to field devices withoutallocated I/O paths and DT/DSTs that are unassigned may instead berepresented by respective device placeholder objects 232 stored in anasset object system 230. Accordingly, in some embodiments, to generatethe respective virtual I/O objects 234 for unassigned or unallocatedDTs/DSTs, the method 700 may include copying the respective deviceplaceholder object(s) 232 stored in the asset object system 230. In someimplementations, the asset object system 230 is included in theconfiguration database 216.

Additionally or alternatively, the configuration database 216 may storetemplate objects for particular types of DTs/DSTs. As such, for someunassigned and/or unallocated DTs/DSTs that are referenced by thecontrol modules or routines that are to be executed by the physicalcontroller 11 during runtime, the configuration application 216 maydetermine a type of the subject DT/DST. Accordingly, to create acorresponding virtual I/O object 234, the configuration application 216may create a copy of the template object of the particular type ofDT/DST as the corresponding virtual I/O object 234.

Additionally, generating the virtual I/O objects 234 (block 706) mayinclude generating a simulation module for at least one of the virtualI/O objects 234. As described above, a simulation module may enable avirtual I/O object 234 to respond to the virtual controller 236 as ifthe response was provided by a physical field device. In one embodiment,the configuration database 216 includes template simulation objects thatare configured to mimic the performance of particular types of DTs/DSTs.In some cases, the simulation objects also include default simulationvalues. Accordingly, in an embodiment, when generating the virtual I/Oobject 234 (block 706), the configuration application 72 a, 210A mayinclude or otherwise indicate a particular template simulation objectcorresponding to the particular type of DT/DST that the virtual I/Oobject 234 is virtualizing.

At block 708, the method 700 may include storing the generated virtualI/O objects 234 at respective locations in the configuration database216. To this end, in an example implementation, when the configurationapplication 72 a, 210A stores the virtual I/O objects 234 in theconfiguration database 216, the configuration application 72 a 210A alsoassigns to each virtual I/O object 234 a path via which the each virtualI/O object 234 may be accessed. In some embodiments, the configurationdatabase 216 includes a dedicated storage area for storing the virtualI/O objects 234. It should be appreciated that any DT/DST objectcorresponding to a particular virtual object 234 may remain stored inthe configuration database 216, and any device placeholder object 232 onwhich the particular virtual I/O object 234 is based may remain storedin the asset object system 230.

At block 710, the method 700 may include instantiating a virtualcontroller 236 in a simulation environment by substituting references tothe location of a particular DT/DST object with the respective locationin the configuration database 216 for its corresponding virtual I/Oobject 234. To this end, in an embodiment, when setting up orestablishing the virtual controller 236 at the simulation system, theconfiguration application 72 a, 210A identifies any reference to an I/Odevice that is included in the control modules that are assigned to beimplemented by the virtualized controller 236. Accordingly, theconfiguration application 72 a, 210A modifies the control modules and/orthe function blocks therein to include the respective paths to thevirtual I/O objects 234 whenever a path to a DT/DST is required. Thus,the virtual controller 236 responds as if a field device providedresponse data without having to download the control routines into aphysical controller 11, 262.

In some embodiments, the virtual controller 236 is utilized to conducttesting as part of commissioning the back-end environment prior to thecontrollers and/or field devices being fully commissioned. Accordingly,the engineer may interact with a simulation application to simulateparticular input values for virtual I/O objects 234 associated withinput devices. As described herein, the simulation application may be astandalone application or a plug-in to the configuration application 72a, 210A. However, even when the simulation application is a standaloneapplication, the same one or more processors that execute theconfiguration application 72 a, 210A also execute the simulationapplication.

Accordingly, in some embodiments, the simulation application receives anindication of an input value for a particular virtual DST associatedwith an input device, such as a field device providing an input to thecontroller. In one embodiment, the input value is received through thescreen display 500 of FIG. 5. After receiving the indication of theinput value, the simulation application causes the virtual controller236 to execute a simulation using the input value as the value for anindicated virtual I/O object 234. To this end, in one embodiment, thesimulation application writes the input value to the simulation moduleof the virtual I/O object 234 such that the virtual controller 236reacts as if the input value was generated by a corresponding fielddevice.

After executing the simulation, in some embodiments, the simulationapplication presents an indication of a simulated output value for avirtual I/O object 234 associated with an output device, such as thecontroller providing an output value to a field device. In one example,the output value is presented via the screen display 600 of FIG. 6. Thevirtual I/O object 234 associated with the output device may alsoinclude an output status (e.g., good, bad, caution, high, low, etc.)based on the particular output value. Accordingly, the simulationapplication may also present an indication of the output status for thevirtual I/O object 234 associated with the output device.

It should be appreciated that the virtual controller 236 may reside inthe simulation environment until it is explicitly deleted. Accordingly,the commissioning testing using the virtual controller 236 may occurover multiple hours, days, weeks, etc. During this time, the same ordifferent engineer may modify the control modules assigned to thecorresponding physical controller 262. For example, an additionalcontrol module may be assigned to the physical controller 262, a controlmodule may be unassigned from the physical controller 262, or a controlroutine for a control module may be modified. After these changes occur,the virtual controller 236 no longer reflects the current configurationof the physical controller 262. Accordingly, the simulation applicationmay monitor the configuration database 216 to detect any changes to thecontroller object of the physical controller 262 and/or the controlmodules assigned to the physical controller 262.

Upon detecting a change, in some embodiments, the simulation applicationpresents a notification to an engineer that the simulation should berefreshed to reflect the current configuration of the physicalcontroller 262. Accordingly, the simulation application may receive anindication to refresh the virtual controller 236. In some embodiments,the simulation application directly interacts with the configurationdatabase 72 b, 216 to generate the refreshed virtual controller 236. Inother embodiments, the simulation application utilizes the configurationapplication 72 a, 210A to refresh the virtual controller 236. After thesimulation application refreshes the virtual controller 236, thesimulation application may be utilized to execute simulations using therefreshed virtual controller 236.

It is noted that while the I/O virtualization techniques describedherein are described with respect to a process control system 5, any oneor more of the I/O virtualization techniques described herein areequally applicable to a process control safety information system of aprocess control plant, such as the DeltaV SIS™ product provided byEmerson Process Management. For example, a standalone process controlsafety system or an integrated control and safety system (“ICSS”) may becommissioned using any one or more of the smart commissioning techniquesdescribed herein.

Further, while the I/O virtualization techniques described herein areapplied to scenarios where the process control system 5 is in theprocess of being commissioned, any of the I/O virtualization techniquesare equally applicable to fully commissioned process control systems.That is, even in a fully commissioned process plant a configurationengineer may test and/or simulate a change to a controller in asimulated environment without having to download the changes to thecontroller under test. Further, because, as described herein, thesimulated control module does not include special simulation functionblocks, the I/O virtualization techniques described herein enablesimulation of a controller without modification of production controllogic.

Additionally, when implemented in software, any of the applications,services, and engines described herein may be stored in any tangible,non-transitory computer readable memory such as on a magnetic disk, alaser disk, solid state memory device, molecular memory storage device,or other storage medium, in a RAM or ROM of a computer or processor,etc. Although the example systems disclosed herein are disclosed asincluding, among other components, software and/or firmware executed onhardware, it should be noted that such systems are merely illustrativeand should not be considered as limiting. For example, it iscontemplated that any or all of these hardware, software, and firmwarecomponents could be embodied exclusively in hardware, exclusively insoftware, or in any combination of hardware and software. Accordingly,while the example systems described herein are described as beingimplemented in software executed on a processor of one or more computerdevices, persons of ordinary skill in the art will readily appreciatethat the examples provided are not the only way to implement suchsystems.

Thus, while the present invention has been described with reference tospecific examples, which are intended to be illustrative only and not tobe limiting of the invention, it will be apparent to those of ordinaryskill in the art that changes, additions or deletions may be made to thedisclosed embodiments without departing from the spirit and scope of theinvention. Further, although the forgoing text sets forth a detaileddescription of numerous different embodiments, it should be understoodthat the scope of the patent is defined by the words of the claims setforth at the end of this patent and their equivalents. The detaileddescription is to be construed as exemplary only and does not describeevery possible embodiment because describing every possible embodimentwould be impractical, if not impossible. Numerous alternativeembodiments could be implemented, using either current technology ortechnology developed after the filing date of this patent, which wouldstill fall within the scope of the claims and all equivalents thereof.

Embodiments of the techniques described in the present disclosure mayinclude any number of the following aspects, either alone orcombination:

1. A computing device for virtualizing input/output (I/O) of a processcontroller in a process plant during commissioning of the process plant,the computing device comprising: a configuration database; one or moreprocessors; and a non-transitory computer-readable medium coupled to theconfiguration database and the one or more processors and storing aconfiguration application thereon, that when executed by the one or moreprocessors, causes the computing device to: receive an indication of acontrol module that is to be executed by a process controller in aruntime environment of the process plant; and receive a request tosimulate the process controller, and based on the received request:generate, by using the configuration database, a respective virtualdevice signal tag (DST) for each DST included in the control module;store each virtual DST at a respective location of the configurationdatabase; and instantiate, in a simulation environment, the controlmodule at a virtual controller corresponding to the process controller,including substituting a reference to a respective location of the eachDST with the respective location in the configuration database of theeach virtual DST.

2. The computing device according to aspect 1, wherein a firstparticular DST included in the control module is allocated to a fielddevice; and the respective virtual DST of the first particular DSTcomprises a copy of data stored in an instance of a DST objectcorresponding to the first particular DST and configured for the fielddevice.

3. The computing device according to any one of the preceding aspects,wherein a second particular DST included in the control module is oneof: not allocated to any field device, or not assigned to any fielddevice; and the respective virtual DST of the second particular DSTcomprises a copy of a template object corresponding to a type of thesecond particular DST, the copy of the template object storing defaultparameter values.

4. The computing device according to any one of the preceding aspects,wherein the computing device is communicatively connected to an assetobject system of the process plant, the asset object system storingdevice placeholder objects.

5. The computing device of according to any one of the precedingaspects, wherein a third particular DST included in the control moduleis not allocated to any field device; and the respective virtual DST ofthe third particular DST comprises a copy of a device placeholder objectfor the third particular DST stored in the asset object system.

6. The computing device according to any one of the preceding aspects,wherein a fourth particular DST included in the control module is notassigned to any field device; and the respective virtual DST of thefourth particular DST comprises a copy of a device placeholder objectfor the fourth particular DST stored in the asset object system.

7. The computing device according to any one of the preceding aspects,wherein the configuration application further causes the computingdevice to receive an indication of an input value for the controlmodule; and simulate the process controller executing the control moduleby providing the input value to a virtual DST associated with an inputto the virtual controller.

8. The computing device according to any one of the preceding aspects,wherein the simulation of the process controller executing the controlmodule generates an output value via a virtual DST associated with anoutput of the virtual controller, the output value generated by thevirtual controller based on the input value.

9. The computing device according to any one of the preceding aspects,wherein the configuration application further causes the computingdevice to download the control routine into the process controller.

10. A method for virtualizing input/output (I/O) of a module in aprocess plant, the comprising receiving, by one or more processorsexecuting at least a configuration application, an indication of acontrol module that is to be executed by a process controller in aruntime environment of the process plant; and receiving, by the one ormore processors, a request to simulate the process controller, and uponreceiving the request: generating, by accessing the configurationdatabase, a respective virtual device signal tag (DST) for each DSTincluded in the control module; storing each virtual DST at a respectivelocation of the configuration database; and instantiating the controlmodule at a virtual controller corresponding to the process controller,including substituting a reference to a respective location of the eachDST with the respective location in the configuration database of theeach virtual DST.

11. The method according to aspect 10, wherein a first particular DSTincluded in the control module is allocated to a field device; andgenerating the respective virtual DST of the first particular DSTcomprises generating a copy of data stored in an instance of a DSTobject corresponding to the first particular DST and configured for thefield device.

12. The method according to any one of aspects 10-11, wherein a secondparticular DST included in the control module is not allocated to anyfield device; and generating the respective virtual DST of the secondparticular DST comprises generating a copy of a template objectcorresponding to a type of the second particular DST, the copy of thetemplate object storing default parameter values.

13. The method according to any one of aspects 10-12, wherein a thirdparticular DST included in the control module is not allocated to anyfield device; and generating the respective virtual DST of the thirdparticular DST comprises generating a copy of a device placeholderobject for the third particular DST stored in an asset object system.

14. The computing device according to any one of aspects 10-13 wherein afourth particular DST included in the control module is not assigned toany field device; and generating the respective virtual DST of thefourth particular DST comprises generating a copy of a deviceplaceholder object for the fourth particular DST stored in an assetobject system.

15. The method according to any one of aspects 10-14, further comprisingreceiving, by the one or more processors, an indication of an inputvalue for the control module; and simulating the process controllerexecuting the control module by providing the input value to a virtualDST associated with an input to the virtual controller.

16. The method according to any one of aspects 10-15, wherein thesimulating the process controller executing the control module comprisesobtaining an output value via a virtual DST associated with an output ofthe virtual controller, the output value generated by the virtualcontroller based on the input value.

17. The method according to any one of aspects 10-16, further comprisingdetecting, by the one or more processors, a change to the controlmodule; and refreshing, by the one or more processors, the virtualcontroller to include the detected change; and executing, by the one ormore processors, an updated simulation using the refreshed virtualcontroller.

18. The method according to any one of aspects 10-17, further comprisingdownloading, by the one or more processors, the control routine into theprocess controller.

What is claimed:
 1. A computing device for virtualizing input/output(I/O) of a process controller in a process plant during commissioning ofthe process plant, the computing device comprising: a configurationdatabase; one or more processors; and a non-transitory computer-readablemedium coupled to the configuration database and the one or moreprocessors and storing a configuration application thereon, that whenexecuted by the one or more processors, causes the computing device to:receive an indication of a control module that is to be executed by aprocess controller in a runtime environment of the process plant; andreceive a request to simulate the process controller, and based on thereceived request: generate, by using the configuration database, arespective virtual device signal tag (DST) for each DST included in thecontrol module; store each virtual DST at a respective location of theconfiguration database; and instantiate, in a simulation environment,the control module at a virtual controller corresponding to the processcontroller, including substituting a reference to a respective locationof the each DST with the respective location in the configurationdatabase of the each virtual DST.
 2. The computing device of claim 1,wherein: a first particular DST included in the control module isallocated to a field device; and the respective virtual DST of the firstparticular DST comprises a copy of data stored in an instance of a DSTobject corresponding to the first particular DST and configured for thefield device.
 3. The computing device of claim 1, wherein: a secondparticular DST included in the control module is one of: not allocatedto any field device, or not assigned to any field device; and therespective virtual DST of the second particular DST comprises a copy ofa template object corresponding to a type of the second particular DST,the copy of the template object storing default parameter values.
 4. Thecomputing device of claim 1, wherein the computing device iscommunicatively connected to an asset object system of the processplant, the asset object system storing device placeholder objects. 5.The computing device of claim 1, wherein the configuration applicationfurther causes the computing device to: receive an indication of aninput value for the control module; and simulate the process controllerexecuting the control module by providing the input value to a virtualDST associated with an input to the virtual controller.
 6. The computingdevice of claim 1, wherein the configuration application further causesthe computing device to download the control routine into the processcontroller.
 7. The computing device of claim 4, wherein: a thirdparticular DST included in the control module is not allocated to anyfield device; and the respective virtual DST of the third particular DSTcomprises a copy of a device placeholder object for the third particularDST stored in the asset object system.
 8. The computing device of claim4, wherein: a fourth particular DST included in the control module isnot assigned to any field device; and the respective virtual DST of thefourth particular DST comprises a copy of a device placeholder objectfor the fourth particular DST stored in the asset object system.
 9. Thecomputing device of claim 4, wherein: a fourth particular DST includedin the control module is not assigned to any field device; andgenerating the respective virtual DST of the fourth particular DSTcomprises generating a copy of a device placeholder object for thefourth particular DST stored in an asset object system.
 10. Thecomputing device of claim 5, wherein the simulation of the processcontroller executing the control module generates an output value via avirtual DST associated with an output of the virtual controller, theoutput value generated by the virtual controller based on the inputvalue.
 11. A method for virtualizing input/output (I/O) of a module in aprocess plant, the comprising: receiving, by one or more processorsexecuting at least a configuration application, an indication of acontrol module that is to be executed by a process controller in aruntime environment of the process plant; and receiving, by the one ormore processors, a request to simulate the process controller, and uponreceiving the request: generating, by accessing the configurationdatabase, a respective virtual device signal tag (DST) for each DSTincluded in the control module; storing each virtual DST at a respectivelocation of the configuration database; and instantiating the controlmodule at a virtual controller corresponding to the process controller,including substituting a reference to a respective location of the eachDST with the respective location in the configuration database of theeach virtual DST.
 12. The method of claim 11, wherein: a firstparticular DST included in the control module is allocated to a fielddevice; and generating the respective virtual DST of the firstparticular DST comprises generating a copy of data stored in an instanceof a DST object corresponding to the first particular DST and configuredfor the field device.
 13. The method of claim 11, wherein: a secondparticular DST included in the control module is not allocated to anyfield device; and generating the respective virtual DST of the secondparticular DST comprises generating a copy of a template objectcorresponding to a type of the second particular DST, the copy of thetemplate object storing default parameter values.
 14. The method ofclaim 11, wherein: a third particular DST included in the control moduleis not allocated to any field device; and generating the respectivevirtual DST of the third particular DST comprises generating a copy of adevice placeholder object for the third particular DST stored in anasset object system.
 15. The method of claim 11, further comprising:receiving, by the one or more processors, an indication of an inputvalue for the control module; and simulating the process controllerexecuting the control module by providing the input value to a virtualDST associated with an input to the virtual controller.
 16. The methodof claim 11, further comprising: detecting, by the one or moreprocessors, a change to the control module; and refreshing, by the oneor more processors, the virtual controller to include the detectedchange; and executing, by the one or more processors, an updatedsimulation using the refreshed virtual controller.
 17. The method ofclaim 11, further comprising downloading, by the one or more processors,the control routine into the process controller.
 18. The method of claim15, wherein the simulating the process controller executing the controlmodule comprises obtaining an output value via a virtual DST associatedwith an output of the virtual controller, the output value generated bythe virtual controller based on the input value.